The special case \(p=n+1, p^\prime =N=n+1+k=n+1+\sum _{i=0}^n k_i\)  was considered by Fredrickson and Neitzke in [1]}, in
connection with Argyres-Douglas theories of type \((A_{n},A_{k-1}\) ).
(In their notation: our \(n+1\)  is called \(K\) , and our \(k=\sum _{i=0}^n k_i\)  is called \(N\) .)
Here we have
\(\Lambda ^{(+)}=0,\quad \Lambda ^{(-)}\in P_k.\) 
